<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            /* background-color: red; */
            /* height: 100vh; */
            margin: 0px;
            outline: 2px solid red;
        }
    </style>
</head>
<body>
    <div style="height: 10%; overflow: auto;">
        123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>123<br/>
    </div>
</body>
</html>